hi Jools62
are you sure this will be recorded as your mum 'no longer has capacity' on her medical records, may not be recorded or may be 'didn't have capacity at that time' - of course, without POA for health & welfare or your mum's permission for her GP to speak with you, you may not be able to find out - if there is no record, might you try again with a certificate provider who is a friend and has known her well enough to understand her; this doesn't have to be a medical professional; though nitram's point in post 4 needs to be considered
might it be worth quietly and in simple terms pointing out to your mum what she has done eg 'The doctor now believes you aren't capable of looking after your own affairs so you can't make any decisions yourself only Social Services and the doctor can. I can't do anything on your behalf now as I can't be your Attorney and your bank will freeze your accounts. Someone will have to apply to be your Deputy which will cost you a lot of money, that someone can be chosen for you and may not even be me.' - it may, if she does have capacity to understand, as you appear to believe, shock her into behaving sensibly - maybe even write this out and get her to sign it and/or record the conversation and show/play it to the GP in the hope that the GP will accept that your mum was playing games, knows she was and realises how daft she was ....??!!
sadly, it might be interpreted that the event does show that she no longer has capacity enough to understand the importance of what she is being asked to do, as no-one who did would 'play' such a daft game
it's a shame as not only has it jeopardised the finance & property POA, which can be salvaged (at a financial cost) by you applying to be her deputy (and contacting the OPG and DWP in the meantime to be her appointee to deal with immediate issues such as paying for her care - though hopefully, as much as possible is dealt with by direct debit) but it also means that you won't be able to apply to be her Attorney for health & welfare
however, if you are concerned that she is unsafe in her own home (I'm thinking of your comments on your other thread) and it would be in her best interests now to be cared for full time, as she 'no longer has capacity' you could contact her Local Authority Adult Services, explain the situation and request a best interest meeting be called to make decisions on her future care
if you do apply to be her Deputy, make sure you have included such things as acting for her to sell her house so that you don't later have to make a further application specifically for selling her property
as for financial support - should your mum stay in her bungalow and her other savings/assets reach the £23250 threshold, then the LA will be involved (you do have to contact them, it's not automatic) and will begin to part fund your mum's care fees - I assume (from the level of care you mention in the other thread) that she receives Attendance, and also a disregard of her Council Tax - should your mum move into a care home, she will be self-funding using her income, savings and the proceeds from the sale of the bungalow
it might be a good idea to chat things over with one of the AS helpline operators, as they have a lot of knowledge around POAs and may have contacts to direct you to
0300 222 11 22
Monday to Wednesday 9am – 8pm
Thursday and Friday 9am – 5pm
Saturday and Sunday 10am – 4pm
I hope you find a way to move forward
best wishes
PS just wanted to add that although you do need to have all this sorted out in the long run - right now, you can both continue as you always have as I doubt the GP will jump into action and start informing all and sundry that your mum no longer has capacity - so take some time to think things through - maybe check that your mum's finances can pretty much run themselves with her income, from whatever sources, being paid directly into a bank account and any bills being paid out by direct debit